Sub-heading or heading in light dom feature

[benjaminapetersen]

A subheading attribute would be interesting, but I think it may actually be even better to use a content-selector around a div or some dom element with a class to put whatever HTML provided as the heading. Something to the effect of:

<paper-dialog>
<div class="heading">
    <h2>This is the <strong>title<strong></h2>
    <h3>This is a subtitle</h3>
    <p>Little tiny text snippet saying something clever.</p>
</div>
<div class="content">
<p>This is where all the rest of the stuff goes. </p>
</div>
</paper-dialog>

This seems similar to what has recently been done with paper-button, and how core-header-panel works with the "core-header" class, keeping content in the light dom.

Throwing it out there to chew on.

[ssorallen]

It seems more reasonable to let the user style and maintain the light DOM as he or she sees fit rather than adding more features to what should be a generic element. I would actually go the other direction and say that the <template if="{{heading}}"> might be better off being removed from paper-dialog to stress that this is just a generic container that sits on top of other content. The contents are up to the user.